/*
 * Copyright (C) 2018 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.android.tools.idea.run.util

import java.time.Duration

class StopWatch {
  private var active: Boolean = false
  private var startTimeMillis: Long = 0
  private var endTimeMillis: Long = 0

  val duration: Duration
    get() = if (active) {
      Duration.ofMillis(currentTimeMillis - startTimeMillis)
    } else {
      Duration.ofMillis(endTimeMillis - startTimeMillis)
    }

  private val currentTimeMillis: Long
    get() = StopWatchTimeSource.currentTimeMillis

  init {
    restart()
  }

  fun stop() {
    endTimeMillis = currentTimeMillis
    active = false
  }

  fun restart() {
    startTimeMillis = currentTimeMillis
    active = true
  }
}
